diff --git a/clang/lib/Driver/ToolChains/Darwin.cpp b/clang/lib/Driver/ToolChains/Darwin.cpp
index fe3952ee76229..26e24ad0ab17c 100644
--- a/clang/lib/Driver/ToolChains/Darwin.cpp
+++ b/clang/lib/Driver/ToolChains/Darwin.cpp
@@ -1411,8 +1411,8 @@ StringRef Darwin::getSDKName(StringRef isysroot) {
   auto EndSDK = llvm::sys::path::rend(isysroot);
   for (auto IT = BeginSDK; IT != EndSDK; ++IT) {
     StringRef SDK = *IT;
-    if (SDK.ends_with(".sdk"))
-        return SDK.slice(0, SDK.size() - 4);
+    if (SDK.consume_back(".sdk"))
+      return SDK;
   }
   return "";
 }